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| Special Issue 9 | ||
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| In This Issue | ||
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| Titration Techniques | ||
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Jerrold J. Jacobsen, Kelly Houston Jetzer, and Néha Patani University of Wisconsin-Madison, Madison, WI 53706-1396 John Zimmerman Wabash College, Crawfordsville, IN 47933 Gerald Zweerink Missouri Western State College, Saint Joseph, MO 64507
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| About This Issue | ||
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John W. Moore and Jon L. Holmes University of Wisconsin-Madison, Madison, WI 53706-1396 |
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Note: |
Order Item Number: SP-9 |
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Manual titrations are often included in introductory labs because the required equipment is not very expensive; because students learn important chemistry, including stoichiometry; and because the required laboratory techniques require cleanliness, accuracy, repeatability of measurement, and safety. Titrations are not too complicated, but also not trivial. They require an understanding of underlying chemistry, an awareness of good laboratory technique, and some skill at doing several things simultaneously. Titration Techniques has been designed to help teachers improve the effectiveness of this laboratory experience. Generally, students' time in the lab is very limited. They may be doing for the first time a technique with "a hundred ways to do it wrong". Titration Techniques is intended as a pre-lab resource for students prior to their first titration, as well as review material for use later. It would be appropriate to use the video material as part of a "just-in-time" multimedia module for students to access via computer during the laboratory itself, or to incorporate it into pre-lab tutorials, exercises, or certification processes that encourage students to come into the lab better prepared. Frame numbers and barcodes are provided in the documentation so that each video segment can be accessed quickly and easily using a remote control for the videodisc player or a barcode reader. Software is also provided so that those with IBM PC compatible computers with Windows or Macintosh computers can click on a video segment's name and have it displayed by a computer-interfaced videodisc player. Whether the disc is used stand alone or with a computer, students will see close-up views of each procedure, and a teacher can direct their attention to important observations as well as provide interpretations of what is seen. The laser videodisc medium allows for immediate access to each technique, pausing, backing up, viewing in slow motion, repeating, and carefully examining what is happening. Titration Techniques can also be used by students individually or in small groups. Using the printed documentation a teacher can prepare written materials that direct students to view appropriate segments, make observations, and draw conclusions. This can be done using frame numbers and a hand control or with barcodes. Barcodes in the documentation can be photocopied into locally produced materials for this purpose. The procedures can also be built into computer-based materials developed by an individual teacher. Such materials can be created using HyperCard on a Macintosh, ToolBook under Windows on an IBM compatible computer, or other such multimedia authoring systems. Such uses are allowed, even encouraged, provided they are noncommercial. Hardware and Software Requirements Titration Techniques is a 12-in., double-sided, 60-minute, CAV-type laser videodisc in NTSC format (it is incompatible with the PAL standard used in many European countries). It may be operated from any videodisc player using a hand-held remote-control keypad or a barcode reader. (Consult the supplier of your videodisc player to ascertain whether it can be used with a barcode reader.) To make the video presentation visible to students in a classroom either a large-screen color monitor or a color video projection unit will be needed. The size of the monitor (or the need for a projection unit) depends on the size of the class to which the presentation will be made. Computer Control: If the disc is to be used under computer control, the videodisc player must have a serial (RS-232) interface. Software is supplied with the videodisc for both Macintosh and IBM compatible computers. The Macintosh version requires an Apple Macintosh with a hard disk drive. Macintosh computers running under System Software version 6 without MultiFinder must have at least 2 MB of memory and System Software version 6.0.5 or later. Macintoshes using System 7 or System 6 with MultiFinder require a minimum of 4 MB of memory. The Windows/IBM PC version requires Microsoft Windows version 3.1 or later and associated hardware as defined by Microsoft. We recommend an IBM PC compatible computer with an 80386 or higher processor, a minimum of 4 MB of memory, a hard disk, one floppy disk drive to install the software, and a Windows-compatible graphics card, such as an IBM VGA or a Super VGA adapter with a compatible color monitor, and a mouse. DOS version 5.0 or later is highly recommended. Availability
Available: Now
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Last Updated: March 19, 2001 Created: December 10, 1996 |
Created by: J.L. Holmes Comments to: jceonline@chem.wisc.edu |
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| © 1997 Division of Chemical Education, Inc., American Chemical Society. All rights reserved. | |